In Situ Geotechnical Investigation of a Short Section of the Brazos River Post-Hurricane Harvey Using a Portable Free Fall Penetrometer

In Situ Geotechnical Investigation of a Short Section of the Brazos River Post-Hurricane Harvey Using a Portable Free Fall Penetrometer
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使用便携式自由落体贯入仪对飓风“哈维”后的布拉索斯河一小段进行现场岩土工程调查

DOI:
10.1061/9780784482810.079
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发表时间:
2020
期刊:
ASCE Geo-Congress 2020
影响因子:
--
通讯作者:
Ravichandran, Nadarajah
Ravichandran, Nadarajah
中科院分区:
--
文献类型:
--
作者:
Jaber, Reem;Stark, Nina;Jafari, Navid;Ravichandran, Nadarajah

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飓风哈维是萨菲尔-辛普森飓风等级中的四级飓风,从墨西哥湾逼近,在德克萨斯州和路易斯安那州造成严重洪灾。布拉索斯河沿着记录的水位超过了历史最高水位,在河流沿着的许多地方都观察到河岸的侵蚀和边坡破坏。在飓风哈维过后,在德克萨斯州Sugarland的Brazos河沿着一小段进行了近地表现场调查。现场测试使用便携式自由落体重力仪和啁啾声纳。结果表明,沉积物性质在不同位置之间存在差异。在两个河岸观察到松散顶层下的较弱沉积物,渗透深度约为20 cm,而在河流中心发现较硬的沉积物,在沉积物深度小于7 cm时,估计最大准静态承载力范围为25至300 kPa。粒度分布也随位置而变化。结果表明,沉积物强度和啁啾声纳的后向散射强度之间的相关性。总之,横跨和沿着Brazos河短段的原位岩土性质表现出显著的变异性,可能受当地沉积物再动员过程的影响,这反映在河床表面的便携式自由落体重力仪和啁啾声纳测量中。
Hurricane Harvey, a category 4 hurricane on the Saffir-Simpson hurricane wind scale that approached from the Gulf of Mexico, caused severe flooding in Texas and Louisiana. Recorded water levels along the Brazos River exceeded historic high-water levels, and erosion and slope failures of riverbanks were observed in many locations along the river. A near-surface site investigation was conducted in the Brazos River along a short section in Sugarland, Texas, post-Hurricane Harvey. In situ tests were conducted using a portable free fall penetrometer and a chirp sonar. Results showed that sediment properties varied between different locations. Weaker sediments underlying a loose top layer were observed at both riverbanks reaching a penetration depth of ~20 cm, whereas stiffer sediments were found at the center of the river with an estimate of maximum quasi-static bearing capacity ranging from 25 to 300 kPa at sediment depths less than 7 cm. Particle size distributions varied as well depending on the location. Results suggest a correlation between sediment strength and backscatter intensity of the chirp sonar. In summary, in situ geotechnical properties across and along short sections of the Brazos River exhibited a significant variability, likely governed by the local sediment remobilization processes that was reflected in portable free fall penetrometer and chirp sonar measurements of the riverbed surface.
DOI: 10.23919/oceans.2011.6106914
发表时间: 2011
期刊: OCEANS'11 MTS/IEEE KONA
影响因子: --
作者:
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发表时间: 2007
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